The magnetic activity of stars like sun, which is the root cause of the sunspot cycle, is still poorly understood even after decades of intense study.
磁场的变化是像太阳这样的恒星表面黑子活动周期的根源，尽管经过几十年的认真研究之后，地球人仍然对其知之甚少。
Every 22 years, the sun's magnetic field switches north and south, creating an 11-year sunspot cycle.
太阳上的南北极每二十二年对调一次，由此产生长达十一年的太阳黑子周期。
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